2.63a texture bump in nodes
Newer versions of blender (added in 2.65) allow you to feed normal data (bump maps) into the shader nodes allowing the shader to adjust itself to the altered surface of the model. Also the normal Map node was added that gives us more control over how the normal map is applied.

The closest alternative you have in 2.63 is to connect your bump map into the displace socket of the Material Output.